package com.atguigu.gulimall.ware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.atguigu.common.exception.NoStockException;
import com.atguigu.common.to.mq.StockDetailTo;
import com.atguigu.common.to.mq.StockLockedTo;
import com.atguigu.common.utils.R;

import com.atguigu.gulimall.ware.entity.WareOrderTaskDetailEntity;
import com.atguigu.gulimall.ware.entity.WareOrderTaskEntity;
import com.atguigu.gulimall.ware.feign.OrderFeignService;
import com.atguigu.gulimall.ware.feign.ProductFeignService;
import com.atguigu.gulimall.ware.service.WareOrderTaskDetailService;
import com.atguigu.gulimall.ware.service.WareOrderTaskService;
import com.atguigu.gulimall.ware.vo.OrderItemVo;
import com.atguigu.gulimall.ware.vo.OrderVo;
import com.atguigu.gulimall.ware.vo.SkuHasStockVo;
import com.atguigu.gulimall.ware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import lombok.extern.slf4j.Slf4j;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;


import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.ware.dao.WareSkuDao;
import com.atguigu.gulimall.ware.entity.WareSkuEntity;
import com.atguigu.gulimall.ware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;
@RabbitListener(queues = "stock.release.stock.queue")
@Slf4j
@Transactional
@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;
    @Autowired
    private ProductFeignService productFeignService;
    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    WareOrderTaskService orderTaskService;


    @Autowired
    OrderFeignService orderFeignService;


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        /**
         * skuId: 112
         * wareId: 1
         */
        QueryWrapper<WareSkuEntity> wrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(skuId)) {
            wrapper.eq("sku_id", skuId);
        }

        if (!StringUtils.isEmpty(wareId)) {
            wrapper.eq("ware_id", wareId);
        }


        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),
                wrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {

        //判断如果还没有这个库存记录，新增
        List<WareSkuEntity> entities = wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));

        if (entities == null || entities.size() == 0) {
            WareSkuEntity wareSkuEntity = new WareSkuEntity();
            wareSkuEntity.setSkuId(skuId);
            wareSkuEntity.setWareId(wareId);
            wareSkuEntity.setStock(skuNum);

            wareSkuEntity.setStockLocked(0);
            //TODO远程查询商品名字
            R info = productFeignService.info(skuId);

            if (info.getCode() == 0) {
                Map<String, Object> skuInfo = (Map<String, Object>) info.get("skuInfo");

                wareSkuEntity.setSkuName((String) skuInfo.get("skuName"));

            }

            wareSkuDao.insert(wareSkuEntity);

        } else {

            wareSkuDao.addStock(skuId, wareId, skuNum);
        }
    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {

            SkuHasStockVo skuHasStockVo = new SkuHasStockVo();

            //查询当前sku的总库存量
            Long count = baseMapper.getSkuStock(skuId);

            skuHasStockVo.setSkuId(skuId);
            skuHasStockVo.setHasStock(count == null ? false : count > 0);

            log.info("skuHasStockVo的值是：{}", skuHasStockVo);
            return skuHasStockVo;
        }).collect(Collectors.toList());


        return collect;
    }

    //锁定库存

    /**
     * @param vo
     * @return
     * 库存解锁的场景
     * 1）、下订单成功，订单过期没有支付被系统自动取消，被用户手动取消，都要解锁库存
     * 2）、下订单成功，库存锁定成功，其他业务调用失败，导致订单回滚，之前锁定的库存就要解锁
     */
    @Override
    @Transactional(rollbackFor = NoStockException.class) //默认运行时异常都会回滚
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单详情
         * 追溯。
         */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1、按照下单的收货地址，找到一个就近仓库，锁定库存

        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();

        List<SkuWareHasStock> collect = locks.stream().map(item -> {

            Long skuId = item.getSkuId();

            SkuWareHasStock stock = new SkuWareHasStock();

            stock.setSkuId(skuId);

            stock.setNum(item.getCount());

            //查询这个商品在哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);

            stock.setWareId(wareIds);

            return stock;
        }).collect(Collectors.toList());

        //2.锁定库存

        Boolean allLock = true;

        for (SkuWareHasStock hasStock : collect) {

            Boolean skuStocked = false;

            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();

            if (wareIds == null || wareIds.size() == 0) {
                //没有任务仓库有库存
                throw new NoStockException(skuId);
            }

            // 1、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给mq
            // 2、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使解锁记录，由于数据库查不到id，所以就不用解锁。
            for (Long wareId : wareIds) {

               Long count =  wareSkuDao.lockSkuStock(skuId,wareId,hasStock.num);

               //成功返回1 否则返回0
                if(count == 1){
                    //锁定成功
                    skuStocked = true;
                    //TODO：
                    //告诉mq库存锁定成功
                    WareOrderTaskDetailEntity entity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.num, taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(entity);

                    StockLockedTo stockLockedTo = new StockLockedTo();

                    stockLockedTo.setId(taskEntity.getId());

                    StockDetailTo detailTo = new StockDetailTo();


                    BeanUtils.copyProperties(entity,detailTo);
                    stockLockedTo.setDetailTo(detailTo);
                    //rabbitmq
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",stockLockedTo);
                    break;
                }else {
                    //当前仓库锁定失败，锁下一个
                    skuStocked = false;
                }
            }

            if(skuStocked ==false){
                //当前商品所有仓库都没锁住
                throw new NoStockException(skuId);
            }


        }

        //全部锁定成功

        return true;
    }

    @Override
    public void unlock(StockLockedTo to) {

        System.out.println("收到解锁库存消息");

        Long id = to.getId();

        StockDetailTo detailTo = to.getDetailTo();

        Long detailToId = detailTo.getId();

        //解锁
        //1、查询数据库关于这个订单的锁定库存信息
        // 有：证明库存锁定成功
        // 没有：库存锁定失败，库存回滚了
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailToId);

        if(byId!=null){
            //解锁

            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();

            R r = orderFeignService.getOrderStatus(orderSn);
            //订单数据返回成功
            if(r.getCode()==0){

                OrderVo data = r.getData(new TypeReference<OrderVo>() {
                });


                if(data==null||data.getStatus() == 4){
                    //订单不存在
                    //订单已经被取消，需要解锁库存
                    unLockStock(detailTo.getSkuId(),detailTo.getWareId(),detailTo.getSkuNum(),detailToId);


                }else {
                    //消息拒绝后重新放到队列里面，让别人继续消费解锁

                    throw new RuntimeException("远程服务失败");

                }
            }



        }
    }

    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){

        wareSkuDao.unlockStock(skuId,wareId,num);

    }

    @Data
    class SkuWareHasStock {
        private Long skuId;

        private List<Long> wareId;

        private Integer num;
    }

}